研究目的
Studying carbon ion emission from femtosecond laser ablation of a glassy carbon target and the effects of laser pulse fluence and external electric field on ion yield and charge state.
研究成果
Femtosecond laser ablation of carbon generates multicharged ions up to C6+. The ion yield and maximum charge state are strongly affected by laser fluence. An external electric field enhances ion extraction. The effective plasma ion temperature is determined to be ~6.9 eV.
研究不足
The study is limited by the laser fluence range and the detection sensitivity of the time-of-flight detector. Plasma shielding effects and ion loss in the transport line are not fully accounted for.
1：Experimental Design and Method Selection:
A Ti:sapphire laser is used to ablate a glassy carbon target, and ion emission is detected by a time-of-flight detector with a retarding field analyzer.
2：Sample Selection and Data Sources:
A glassy carbon target (99.99% purity) is ablated, and ion signals are detected and analyzed.
3：99% purity) is ablated, and ion signals are detected and analyzed.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Ti:sapphire laser, glassy carbon target, time-of-flight detector, retarding field analyzer, Faraday cup, oscilloscope.
4：Experimental Procedures and Operational Workflow:
The laser is focused on the target, ion emission is detected, and signals are analyzed with and without an external electric field.
5：Data Analysis Methods:
The ion time-of-flight signal is fitted to a shifted Maxwell-Boltzmann distribution to determine plasma ion temperature and ion energy.
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